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It’s ironic that the national sport of Japan—who’s inhabitants are some of the skinniest and most gentle in the world—involves two overweight men trying to shove each other out of a ring.

The truth is that it’s not just flab that makes a sumo wrestler’s girth; there’s a whole lot of muscle underneath it all.

The ideal weight for a sumo wrestler is anything from 400 to 600 pounds. This means that it takes not only strength and flexibility to be a sumo—it also takes the right diet. Eating is an essential part of their training.

Sumo-size me

A typical sumo wrestler eats a daily diet of 20,000 calories, which is pretty astounding when you consider that the recommended daily intake for a healthy, active male is 2,500. They eat 10 times what a normal male eats and all of it’s done in two massive 10,000-calorie meals. The sumo’s diet is an expression of my favorite Japanese cultural trait—never doing things halfway.

Here is a typical sumo wrestler daily eating schedule:

Skip breakfast

A sumo wrestler’s day starts at four or five o’clock in the morning with training and exercise. Surprisingly, breakfast is not served. Skipping breakfast and working out instead slows down the wrestler’s metabolism, so they usually don’t eat until around 11am. It also gets them hungry enough for that 10,000-calorie lunch.

Bulk load

The main dish that sumo wrestlers eat is a stew called chankonabe (ちゃんこ鍋). It sounds a little like ‘chunk nabe,’ which is somehow oddly appropriate. This is a stew filled with fish, vegetables, meat and tofu. Nabe (鍋) is a traditional Japanese stew, but chankonabe is the supersized version, stuffed full of extra everything for the sole purpose of providing calories.

To complement their mighty meal, sumo wrestlers eat around 5–10 bowls of rice and copious amounts of beer, required for empty calories. A healthy rikishi (力士, sumo wrestler) may down as many as 6 pints during the midday meal.

Take a siesta

After lunch, there’s one more essential bit of training—the nap. How could you not pass out after a meal like that? Sumo wrestlers take a siesta for as long as 4 hours after lunch, in order to slow down their metabolism and add everything they just ate to their girth.

Dinner and lights out

At the end of the day, sumo wrestlers eat another massive meal and call it a night. While
they sleep, the day’s protein and calories work their magic and they wake up in the early
morning ready to smash their bodies against each other.

Chankonabe: Recommended by sumo wrestlers – it has to be good

Although hearty, chankonabe is actually quite healthy. It’s not your triple Whopper or deep-fried pizza. The stew is full of fresh veggies, tofu, fish and either pork, chicken or beef.
In case they aren’t full after the goodies are eaten and there’s just soup left, the sumo often dump a pile of noodles into the bowl.

You can eat chankonabe at restaurants throughout Japan. It comes in a number of different flavours including salt, soy sauce, miso, kimchee and more. Just bring a good appetite.

The restaurants in the Ryogoku area of Tōkyō, known as “Sumo Town” because it’s the home of the Japan Sumo Association, are particularly popular. You can also find other restaurants there that tailor to rikishi and serve ridiculously large dishes of curry and other typical meals.

Editor's note: The National Geographic video below is worth watching if you're interested in this topic: